Hand press



Feb. 23 1926.

- A. TETETLENI HAND PRESS Filed March 13, 1925lllllllllllllllllllIlllllllllllllllllllllll Patented Feb. 23, 1926..

UNITED stares ARMIN TETE'TLENI, or BUDAPEST, HUNGARY.

HAND PRESS.

Application filed. March 13, 1925. Serial No. 15,300.

To all whom, it may concern:

Be it known that I, ARMIN Tia'rii'riaem. a Hungarian subject. residingat 10 Jozsef Ter. Budapest V, Hungary, have invented certain new anduseful Improvements in or Relating to Hand Presses, of which thefollowing is a specification.

The present invention relates to a hand press for the manufacture ofrectangular bodies particularly building elements.

According to one feature of the invention a cover plate is mountedopposite the press plunger for the preliminary compression of thematerial and is made movable for this purpose.

According to another feature of the in vention the press plunger itselfis provided. with two transmitting devices. one of which serves forpressing and the other for e:-:pel ling the finished bricks.

Finally a cam used in the press according to the invention is speciallyshaped whereby the hardening thereof is facilitated.

An example of a constructional form of the invention is illustrated inthe accompanying drawings, in which:

Figure 1 is a transverse section of a brick press according to thisinvention;

Figure 2 is a longitudinal section thereof;

Figure 3 illustrates a special constructional form of the cam insection, and

Figure 4 shows the cam in front elevation.

On the standards of the machine 1 is mounted a mould 2 the hollow spaceof which is bounded below by a press plunger 3 and above by a coverplate 4. which is connected to levers 7 fulcrumed on pivots 5 and 6. Thelevers 7 are prolonged into rods 8 which may be provided with a handle 9passing through their ends and arranged longitudinally of the machine.The pivots 5 and 6 pass through yokes or stirrups 10, 11 which areengaged over a lower transverse support 12. The yoke or stirrup 10 isalso screwed to the transverse support while the yoke or stirrup 11 canbe disengaged, so that the lever 7 can be rocked by the aid of thehandle 9 into the position indicated by the dotted lines. I

The press plunger 3 carries on 1ts lower part a roller 1 1 which rotateson a spindle .13 and bears upon a motion transmitting device 16 whichlatter is keyed on a shaft 15 carried in the transverse support 12. As atransmitting device it is most convenient to use a power cam. On the endof the shaft leased.

15 iskeyed a hand lever 17 which serves to operate the transmittingdevice.

The press plunger 3 is provided with a lower extension 18 to which isattached a pedal 20 rocking on the spindle 1S). liy operating this pedalthe plunger 3 is raised until its thrust plate reaches the same level asthe upper limit of the hollow space of the mould 2. r H

The press works in the following manner: "he yoke or stirrup 11 isdisengaged from the transverse support 12 and the lever 7 is swung overtogether with the cover plate 1 into the position indicated by dottedlines. Simultaneously the yoke or stirrup 11 is swung together with thearms whereby the hollow space of the mould 2 is exposed or uncovered atthe top. The hollow space is then filled with the material to be pressedand the arm 8 pressed downwards by means of the handle 9, the coverplate l imparting the necessary preliminary compression to the material.To enable the measure or amount of this preliminary compression to heregu lated as may be desired the moulds 2 are stocked in differentheights.

lVhen the cover plate has reached its lowest position, the yoke orstirrup 11 is engaged over the transverse support 12 and the lever 17 isthen depressed in the direction indicated by the arrow :0. The cam 16thus rotates and lifts the press plunger by means of the roller14twhereby the pressing of the moulded article or object is completed.After the lever has been brought back to its original position the yokeor stirrup 11 is disengaged from the transverse support 12 and the coverplate swung into the position indicated by dotted lines by means of therod 8. The pedal 20 is then operated whereupon its other end imparts afurther upward movement to the press plunger 3 so that the plunger liftsthe completed brick out of the mould after which the brick can beremoved. During this movement the roller 14 natural 1y moves away fromthe cam 16 but drops back on to it again when the pedal is re- The mouldis now refilled and the moulding operation repeated.

The power transmitting cams used here have hitherto been constructedsubstantially in the form of general cylindrical surfaces thefundamental curve of which (i. e. the directrix) was constituted by thepower transmitting curve itself: The hardenii'lg of such cams has givenrise to much waste owing to the unequal distribution of the masses inthe cams.

In the course of the experiments which have been made with various formsof cams it has been unexpectedly found that the hardening of these camscan be effected quite easily and almost without any Waste it the cam beprovided with a hub round the hole in the centre.

In Figures 3 and at or the drawing the cam is denoted by 21 and the hubportion according to this invention by 22. This construction also ofiersthe additional advantage that a longer key can be used when fixing thecam on the shaft and the hub portion also lessens the bending strains onthe shaft by better distribution of pressure.

It has been found to be most advantageous il the full axial length ofthe cam so constructed be made to lie between the greatest diameter ofthe cam and one and a hall times this diameter.

What I claim and desire to secure by Letters Patent 01" the UnitedStates is:-

l. A hand press for the manufacture of rectangular bodies particularlybuilding ele* ments, comprising a cover plate pivotally mounted withrespect to the press plunger ill) and producing a preliminarycon'ipression ol' the material to be pressed, and a locking de vicecon'iprising a yoke on said plate adapted to be engaged over a lowertransverse support of the press.

A hand press for the manufacture out rectangular bodies particularlybuilding ele ments, comprising a cover plate pivotally mounted withrespect to the press plunger and producing a preliminary compression ofthe material, a locking device comprising a yoke on said cover plateadapted to be engaged over a lower transverse support of the press, anda motion transmitting device indirectly connected to the press plunger.

8. A hand press for the. manufacture of rectangular bodies, particularlybuilding elements, comprising a cover plate pivotally mounted withrespect'to the press plunger and producing a preliminary compression ofthe material to be pressed, a yoke on said plate adapted to be engagedover a lower transverse support out the press to act as locking device,a motion transmitting device comprising a power cam and a secondarytransmission by means of which the plunger can be lifted oil the cam.

l. A hand press for the manufacture of rcctangula bodies particularlybuilding elements, comprising a cover plate pivotally mounted withrespect to the press plunger and producing a preliminary compression ofthe material to be pressed, and a yoke on said plate adapted to beengaged over lower transverse support of the press to act a lockingdevice, a motion transmitting power cam, a secondary transmission bymeans of which the plunger can be lifted oil the cam, andinterchangeable moulds of dillerent heights adapted to be inserted inthe press to serve for the regulation of the degree of preliminarycompression.

it hand press for the manufacture of rectangular bodies particularlybuilding elements, comprising a cover plate pivotally mounted withrespect to the press plunger and producing a preliminary compression ofthe material to be pressed, a yoke on said plate adapted to be engagedover a lower ti sverse support ofthe press to act as a locking device, amotion transmitting power cam provided on both sides with a hub and asecondary transmission by means of which the plunger can be, lifted ofithe cam.

iii, hand press for the manufacture of rectangular bodies particularlybuilding elements, comprisinga cover plate pivotally mounted withrespect to the press plunger and producing a preliminary compression ofth material to be pressed, yoke on said 7 plate adapted to be engagedover a lower transverse support oithe press to act as a locking oevice,a motion transmittii'ig.power cam provided on both sides with a hub theanal length of which is not less than the Water diameter of the cam andnot greater ran one and a half times this diameter and secondarytransmission by means of which the plunger can be lifted off the" cam.

Armin TETETLENI;

